It is not yet confirmed where Newey will go after he leaves the reigning world champions. Ferrari are rumoured to be an option, though it is also possible the 65-year-old will take a break altogether.
However, the 50-year-old is adamant that he is not the reason for Newey's exit, and said: "I've spoken to Adrian at length about it and Adrian's position is very clear.
"We have enjoyed a great relationship, and we continue to enjoy a great relationship.
"We are friends as well as work colleagues and he's done a huge amount for this team.
"We will be sad to see him leave but he's left the team in good shape and we've got a great team of people and strength and depth to take us forward," he added.